Liu Yuxi (772 ~ 842) was a writer and philosopher in the Tang Dynasty. The word Meng De is from Luoyang (now Henan) and Zhongshan (now Dingxian, Hebei). Zhenyuan (785-805 AD in Tang Dezong) was a scholar, and he studied "Learn from the Past and Learn from the Present". Give supervision and advice. He once participated in the Wang clique and opposed the separatist forces of eunuchs and buffer regions, and was demoted to Sima Langzhou, and later moved to Lianzhou as a secretariat. Later, he was recommended by Pei Du as a guest of honor for the Prince and was added to the history of the school department. The world is called Liu Binke. His poems are popular and fresh, and he makes good use of metaphors to entrust political content. Poems such as Zhuzhi Ci, Liuzhi Ci, and Flower Arrangement Tian Ge are rich in folk songs and unique in Tang poetry. There is Selected Works of Liu Mengde.